The finding of the so-called “Heartbleed” vulnerability, by researchers with Google Inc and a small security firm Codenomicon, prompted the U.S. government’s Department of Homeland Security to advise businesses on Tuesday to review their servers to see if they were using vulnerable versions a type of software known as OpenSSL.

It said updates are already available to address the vulnerability in OpenSSL, which could enable remote attackers to access sensitive data including passwords and secret keys that can decode traffic as it travels across the Internet.

Sounds nasty.